JPS63298827A - Reproducing start method for optical disk device - Google Patents

Abstract

PURPOSE:To reduce the reproduction start response time by starting a focusing control operation and tilt control operation after the start of spindle motor. CONSTITUTION:When a spindle motor 2 is driven to drive a disk 1, a centrifugal force is caused to the disk 1 and the centrifugal force acts on the disk 1 so as to decrease the unevenness of the disk 1 due to warp or the deflection due to bent. Thus, the small correction variable in the focusing control and the title control after the spindle motor driving is required and the control operation is quickened by starting the focusing control and the tilt control after the start of the spindle motor start. Thus, the reproduction start response time is reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention is inspired by a method for starting playback of an optical disc device.

[Prior Art] In conventional optical video disc devices, when the stop button is pressed during playback to stop playback (stop, not pause), the pickup returns to the rest position at the innermost circumference of the disc, resulting in an initial failure. .

The operation at the start of playback is as shown in figure 70 of the fjS3 diagram. When the playback button is pressed (start), the pickup focuses the optical sub-rotate on surface No. 43 near the innermost circumference of the disc. 7. Confirm the 7th frame by performing casing control and tilt control to correct the optical axis of the pickup to be perpendicular to the disk surface in accordance with the inclination of the disk surface. Then, the spindle motor starts rotating.
), and then normal playback starts (S, ).

[Problem to be Solved by the Invention 1] As described above, in the method in which the pickup always returns to the innermost circumference of the disk when stopped, when continuing playback from the part where playback was interrupted, the pickup must be moved from the innermost circumference of the disk. Since it is necessary to perform an operation to advance to the intermediate position where the playback was interrupted, the time from when the playback button is pressed to when playback actually starts becomes long. In order to shorten the time until playback starts (this time is called the playback start response time), the pickup should stop at that position when stopped, and when playback starts
Advantageously, the second step starts from an intermediate position on the disc.

In addition, in order to shorten the playback start response time, it is desirable that the focusing control and tilt control operations be performed quickly, and for this purpose, it is desirable that the unevenness caused by warping and the inclination caused by deflection of the disk be small. , especially when the outer diameter is 30 cm like a regular video disc.
In the case of a large disc, the unevenness and inclination of the disc are larger at the middle part than at the innermost part of the disc, so if the above-mentioned method of starting the pickup from the middle position of the disc at the start of playback is adopted, focusing control, The tilt control operation is not performed quickly, and the reproduction start response time cannot be effectively shortened.

The present invention has been made against the above background, and the pickup is started from the middle position of the disc and playback 1jtf is performed.
An object of the present invention is to provide a method for starting playback of an optical disk device, which enables rapid execution of 7-orcasing control and tilt control when the start is delayed, and which can shorten playback start response time.

Means for Solving Problem E 1 A reproduction starting method of the present invention which solves the above problem is characterized in that the focusing control IvjJ operation and the tilt control operation are started after the spindle motor is started.

[Operation J] When the spindle motor rotates and the disk rotates, centrifugal force is generated on the disk, but this centrifugal force acts to reduce the unevenness of the disk due to warpage or the inclination due to deflection. Therefore, after the spindle motor rotates, the amount of correction in the 7-cushing control and tilt control is small, and the 7-cushing control and tilt control operations can be performed quickly. This shortens the playback start response time.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 1 and fjS2.

The present invention is applied to an optical disc device that is capable of starting a pickup from an intermediate position on the disc at the start of playback.6 An optical disc device that adopts the method of the present invention has a mechanical structure that is different from that of a conventional optical disc device. They are the same, but the operating procedure is different. That is, the operation at the start of playback is shown in Figure 1 at 70-'. When the playback button is pressed (start), the spindle motor first rotates (Pl), then the 7-cushing control and tilt control are activated. Control is performed (P2), and then normal playback is performed (P,).

For example, an optical video disc that uses the playback start method described above! In the IS device, when the spindle motor rotates and the disk rotates, centrifugal force is generated on the disk, and this centrifugal force acts to reduce unevenness due to warpage or inclination due to deflection of the disk. In other words, Fig. 2 shows the resting state of the disk 1 (A),
As shown in (b) during rotation, when the spindle motor 2 is rotated to rotate the disk 1, the disk 1
Due to centrifugal force, the shape approaches the horizontal plane (c) as shown by the two-dot chain line. Therefore, during rotation, the unevenness caused by warpage and the inclination caused by deflection of the disk 1 are reduced.
Even if the pickup 3 is started from the middle position of the disc 1, the amount of correction in the 7 orcusing control and tilt control is small. The time until playback starts, that is, the playback start response time is shortened.

Note that the present invention is not limited to optical video disc devices.
The present invention is applicable to other optical disc components, as well as to write-once optical disc devices and record-and-play optical disc devices, but is particularly effective when the disc diameter is large.

[Effects of the Invention] As explained above, according to the method of the present invention, the focusing control operation and the tilt control 1#J operation are started after the spindle motor is started, so when the pickup is started from the middle position of the disc and playback is started. In this case, the 7-oaking control and tilt control are performed when the unevenness due to warping of the disc or the inclination due to deflection is reduced, and the 7-oaking control and tilt control are performed quickly, shortening the playback start response time. It became possible to do so.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operation at the start of reproduction according to the method of the present invention, FIG. 2 is a diagram for explaining the operation, and FIG. 3 is a diagram 70 of the operation at the start of reproduction according to the conventional method. 1...Disc, 2...Spindle motor, 3...
・Pickup, (a)...Stationary state, (b)...
During the rotation.

Claims (1)

[Claims] A method for starting playback in an optical disc device, comprising starting a focusing control operation and a tilt control operation after starting a spindle motor.